NGC 404

Galaxy NGC 404
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Hubble Space Telescope image
AladinLite
Constellation	Andromeda
Position Equinox: J2000.0, Epoch: J2000.0
Right ascension	01h 09m 27.0s[1]
Declination	+35° 43′ 05″ [1]
Appearance
Morphological type	SA(s)0-: LINER[1][2]
Brightness (visual)	10.0 mag [2]
Brightness (B-Band)	11.0 mag [2]
Angular expansion	3,5′ × 3,5′ [2]
Surface brightness	12.8 mag/arcmin² [2]
Physical data
Affiliation	LGG 11[3]
Redshift	−0,00016 ± 0,00003[1]
Radial velocity	(-48 ± 9) km/s[1]
Hubble distance vrad / H0	(5 ± 1) – 106 Lj (1.5 ± 0.18) Mpc[1]
Absolute brightness	-16.5 mag
Mass	3 · 1010 M☉
Diameter	approx. 11,000 Lj
History
Discovery	William Herschel
Date of discovery	13. September 1784
Catalog designations
NGC 404 – UGC 718 – PGC 4126 – CGCG 520-020 – MCG+06-03-018 – IRAS 01066+3527 – GC 218 – H II 224 – h 89 –

NGC 404 is a Hubble-type S0 lenticular dwarf galaxy in the constellation Andromeda in the northern starry sky. The galaxy is about 10 million light-years away from the Milky Way and has a diameter of about 10,000 light-years.^[4][5]

Seen from Earth, NGC 404 is only seven minutes of arc away from the star Mirach (β Andromedae), which is why the object is also known as the “Ghost of Mirach”

Although NGC 404 is included as a member of the loose galaxy group LGG 11, an actual physical tie to the other members of this group is unlikely due to the large distance involved.

NGC 404 was discovered by Friedrich Wilhelm Herschel on September 13, 1784.^[6]

The mass-to-light ratio is approximately 44 M☉/L☉.

Web links

Commons: NGC 404– Collection of images, videos and audio files

• GALEX
• M. S. del Río, E. Brinks, J. Cepa: High-Resolution H I Observations of the Galaxy NGC 404: A Dwarf S0 with Abundant Interstellar Gas. doi:10.1086/421358.
• Mirach’s Ghost. – Astronomy Picture of the Day from October 29, 2008.

Individual references

1. ↑ ^{a b c d} NASA/IPAC EXTRAGALACTIC DATABASE
2. ↑ ^{a b c d e} SEDS: NGC 404
3. ↑ VizieR
4. ↑ Karachentsev et al: A Catalog of Neighboring Galaxies. In: The Astronomical Journal. Vol. 127, Issue 4, pp. 2031 ff. (2004). bibcode:2004AJ….127.2031K
5. ↑ Jensen et al: Measuring Distances and Probing the Unresolved Stellar Populations of Galaxies Using Infrared Surface Brightness Fluctuations. In: The Astrophysical Journal. Vol. 583, Issue 2, pp. 712 ff. (2003). bibcode:2003ApJ…583..712J
6. ↑ NGC 404 (= PGC 4126), Mirach’s Ghost. Seligman